1
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is $$\tan \left\{ {2{{\tan }^{ - 1}}\left( {{1 \over 3}} \right)} \right\}$$ equal to?
A
$${2 \over 3}$$
B
$${3 \over 4}$$
C
$${3 \over 8}$$
D
$${1 \over 9}$$
2
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is the value of $${\sin ^{ - 1}}{4 \over 5} + {\sec ^{ - 1}}{5 \over 4} - {\pi \over 2}$$ ?
A
$${\pi \over 4}$$
B
$${\pi \over 2}$$
C
$$\pi $$
D
0
3
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If $${\sin ^{ - 1}}{{2p} \over {1 + {p^2}}} - {\cos ^{ - 1}}{{1 - {q^2}} \over {1 + {q^2}}} = {\tan ^{ - 1}}{{2x} \over {1 - {x^2}}}$$, then what is x equal to?
A
$${{p + q} \over {1 + pq}}$$
B
$${{p - q} \over {1 + pq}}$$
C
$${{pq} \over {1 + pq}}$$
D
$${{p + q} \over {1 - pq}}$$
4
NDA Mathematics 21 April 2024
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

If $\cos^{-1} x = \sin^{-1} x$, then which one of the following is correct?

A

$x = 1$

B

$x = \frac{1}{2}$

C

$x = \frac{1}{\sqrt{2}}$

D

$x = \frac{1}{\sqrt{3}}$

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